uart.c revision 1.9 1 /* $NetBSD: uart.c,v 1.9 2011/07/10 23:13:23 matt Exp $ */
2
3 /*-
4 * Copyright (c) 2007 Ruslan Ermilov and Vsevolod Lobko.
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or
8 * without modification, are permitted provided that the following
9 * conditions are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above
13 * copyright notice, this list of conditions and the following
14 * disclaimer in the documentation and/or other materials provided
15 * with the distribution.
16 * 3. The names of the authors may not be used to endorse or promote
17 * products derived from this software without specific prior
18 * written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``AS IS'' AND ANY
21 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
22 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
23 * PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS
24 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
25 * OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
26 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA,
27 * OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
28 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
29 * TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
30 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
31 * OF SUCH DAMAGE.
32 */
33
34 #include <sys/cdefs.h>
35 __KERNEL_RCSID(0, "$NetBSD: uart.c,v 1.9 2011/07/10 23:13:23 matt Exp $");
36
37 #include <sys/param.h>
38 #include <sys/bus.h>
39 #include <sys/conf.h>
40 #include <sys/device.h>
41 #include <sys/ioctl.h>
42 #include <sys/intr.h>
43 #include <sys/kauth.h>
44 #include <sys/kernel.h>
45 #include <sys/proc.h>
46 #include <sys/tty.h>
47
48 #include <dev/cons.h>
49
50 #include <mips/adm5120/include/adm5120var.h>
51 #include <mips/adm5120/include/adm5120_obiovar.h>
52 #include <mips/adm5120/dev/uart.h>
53
54 #define REG_READ(o) bus_space_read_4(sc->sc_st, sc->sc_ioh, (o))
55 #define REG_WRITE(o,v) bus_space_write_4(sc->sc_st, sc->sc_ioh, (o),(v))
56
57 cons_decl(uart_);
58
59 dev_type_open(uart_open);
60 dev_type_open(uart_close);
61 dev_type_read(uart_read);
62 dev_type_write(uart_write);
63 dev_type_ioctl(uart_ioctl);
64 dev_type_tty(uart_tty);
65 dev_type_poll(uart_poll);
66 dev_type_stop(uart_stop);
67
68 const struct cdevsw uart_cdevsw = {
69 uart_open, uart_close, uart_read, uart_write, uart_ioctl,
70 uart_stop, uart_tty, uart_poll, nommap, ttykqfilter, D_TTY
71 };
72
73 struct consdev uartcons = {
74 .cn_getc = uart_cngetc,
75 .cn_putc = uart_cnputc,
76 .cn_pollc = uart_cnpollc,
77 .cn_dev = NODEV,
78 .cn_pri = CN_NORMAL
79 };
80
81 struct uart_softc {
82 device_t sc_dev;
83 struct tty * sc_tty;
84
85 bus_space_tag_t sc_st;
86 bus_space_handle_t sc_ioh;
87 void * sc_ih;
88 };
89
90 extern struct cfdriver uart_cd;
91 static int uart_consattached;
92
93 static int uart_probe (device_t, cfdata_t, void *);
94 static void uart_attach (device_t, device_t, void *);
95
96 void uart_start(struct tty *);
97 int uart_param(struct tty *, struct termios *);
98 int uart_intr(void *);
99
100 CFATTACH_DECL_NEW(uart, sizeof(struct uart_softc),
101 uart_probe, uart_attach, NULL, NULL);
102
103 static int
104 uart_probe(device_t parent, cfdata_t cf, void *aux)
105 {
106 struct obio_attach_args * const oba = aux;
107
108 if (strcmp(oba->oba_name, cf->cf_name) == 0)
109 return (1);
110
111 return (0);
112 }
113
114 static void
115 uart_attach(device_t parent, device_t self, void *aux)
116 {
117 struct obio_attach_args * const oba = aux;
118 struct uart_softc * const sc = device_private(self);
119 struct tty *tp;
120 int maj, minor;
121
122 sc->sc_dev = self;
123 sc->sc_st = oba->oba_st;
124 if (bus_space_map(oba->oba_st, oba->oba_addr, 256, 0, &sc->sc_ioh)) {
125 aprint_error("unable to map device\n");
126 return;
127 }
128
129 /* Establish the interrupt. */
130 sc->sc_ih = adm5120_intr_establish(oba->oba_irq, INTR_FIQ, uart_intr, sc);
131 if (sc->sc_ih == NULL) {
132 aprint_error("unable to establish interrupt\n");
133 return;
134 }
135 REG_WRITE(UART_CR_REG,UART_CR_PORT_EN|UART_CR_RX_INT_EN|UART_CR_RX_TIMEOUT_INT_EN);
136
137 maj = cdevsw_lookup_major(&uart_cdevsw);
138 minor = device_unit(sc->sc_dev);
139
140 tp = tty_alloc();
141 tp->t_oproc = uart_start;
142 tp->t_param = uart_param;
143 sc->sc_tty = tp;
144 tp->t_dev = makedev(maj, minor);
145 tty_attach(tp);
146 if (minor == 0 && uart_consattached) {
147 /* attach as console*/
148 cn_tab->cn_dev = tp->t_dev;
149 aprint_normal(" console");
150 }
151 aprint_normal("\n");
152 }
153
154 int
155 uart_cnattach(void)
156 {
157 cn_tab = &uartcons;
158 uart_consattached = 1;
159 return (0);
160 }
161
162 void
163 uart_cnputc(dev_t dev, int c)
164 {
165 char chr;
166 chr = c;
167 while ((*((volatile unsigned long *)0xb2600018)) & 0x20)
168 continue;
169 (*((volatile unsigned long *)0xb2600000)) = c;
170 }
171
172 int
173 uart_cngetc(dev_t dev)
174 {
175 while ((*((volatile unsigned long *)0xb2600018)) & 0x10)
176 continue;
177 return (*((volatile unsigned long *)0xb2600000)) & 0xff;
178 }
179
180 void
181 uart_cnpollc(dev_t dev, int on)
182 {
183
184 }
185
186
187 /*
188 * TTY device
189 */
190
191 int
192 uart_open(dev_t dev, int flag, int mode, struct lwp *l)
193 {
194 struct uart_softc *sc = device_lookup_private(&uart_cd, minor(dev));
195 struct tty *tp = sc->sc_tty;
196 int s, error = 0;
197
198 s = spltty();
199
200 tp->t_dev = dev;
201 if ((tp->t_state & TS_ISOPEN) == 0) {
202 tp->t_state |= TS_CARR_ON;
203 ttychars(tp);
204 tp->t_iflag = TTYDEF_IFLAG;
205 tp->t_oflag = TTYDEF_OFLAG;
206 tp->t_cflag = TTYDEF_CFLAG | CLOCAL;
207 tp->t_lflag = TTYDEF_LFLAG;
208 tp->t_ispeed = tp->t_ospeed = 115200;
209 ttsetwater(tp);
210 } else if (kauth_authorize_device_tty(l->l_cred, KAUTH_DEVICE_TTY_OPEN,
211 tp) != 0) {
212 splx(s);
213 return (EBUSY);
214 }
215
216 splx(s);
217
218 error = (*tp->t_linesw->l_open)(dev, tp);
219
220 return (error);
221 }
222
223 int
224 uart_close(dev_t dev, int flag, int mode, struct lwp *l)
225 {
226 struct uart_softc *sc = device_lookup_private(&uart_cd, minor(dev));
227 struct tty *tp = sc->sc_tty;
228
229 (*tp->t_linesw->l_close)(tp, flag);
230 ttyclose(tp);
231 return (0);
232 }
233
234
235 int
236 uart_read(dev_t dev, struct uio *uio, int flag)
237 {
238 struct uart_softc *sc = device_lookup_private(&uart_cd, minor(dev));
239 struct tty *tp = sc->sc_tty;
240
241 return ((*tp->t_linesw->l_read)(tp, uio, flag));
242 }
243
244 int
245 uart_write(dev_t dev, struct uio *uio, int flag)
246 {
247 struct uart_softc *sc = device_lookup_private(&uart_cd, minor(dev));
248 struct tty *tp = sc->sc_tty;
249
250 return ((*tp->t_linesw->l_write)(tp, uio, flag));
251 }
252
253 int
254 uart_poll(dev_t dev, int events, struct lwp *l)
255 {
256 struct uart_softc *sc = device_lookup_private(&uart_cd, minor(dev));
257 struct tty *tp = sc->sc_tty;
258
259 return ((*tp->t_linesw->l_poll)(tp, events, l));
260 }
261
262 int
263 uart_ioctl(dev_t dev, u_long cmd, void *data, int flag, struct lwp *l)
264 {
265 struct uart_softc *sc = device_lookup_private(&uart_cd, minor(dev));
266 struct tty *tp = sc->sc_tty;
267 int error;
268
269 error = (*tp->t_linesw->l_ioctl)(tp, cmd, data, flag, l);
270 if (error != EPASSTHROUGH)
271 return (error);
272 return (ttioctl(tp, cmd, data, flag, l));
273 }
274
275 int
276 uart_param(struct tty *tp, struct termios *t)
277 {
278
279 return (0);
280 }
281
282 struct tty*
283 uart_tty(dev_t dev)
284 {
285 struct uart_softc *sc = device_lookup_private(&uart_cd, minor(dev));
286
287 return sc->sc_tty;
288 }
289
290
291 void
292 uart_start(struct tty *tp)
293 {
294 int s,i,cnt;
295
296 s = spltty();
297 if (tp->t_state & (TS_TTSTOP | TS_BUSY))
298 goto out;
299 ttypull(tp);
300 tp->t_state |= TS_BUSY;
301 while (tp->t_outq.c_cc != 0) {
302 cnt = ndqb(&tp->t_outq, 0);
303 for (i=0; i<cnt; i++)
304 uart_cnputc(0,tp->t_outq.c_cf[i]);
305 ndflush(&tp->t_outq, cnt);
306 }
307 tp->t_state &= ~TS_BUSY;
308 out:
309 splx(s);
310 }
311
312 void
313 uart_stop(struct tty *tp, int flag)
314 {
315 int s;
316
317 s = spltty();
318 if (tp->t_state & TS_BUSY)
319 if ((tp->t_state & TS_TTSTOP) == 0)
320 tp->t_state |= TS_FLUSH;
321 splx(s);
322 }
323
324 int
325 uart_intr(void *v)
326 {
327 struct uart_softc *sc = v;
328 struct tty *tp = sc->sc_tty;
329 int c, l_r;
330
331 if (REG_READ(UART_RSR_REG) & UART_RSR_BE) {
332 REG_WRITE(UART_ECR_REG, UART_ECR_RSR);
333 console_debugger();
334 }
335
336 while ((REG_READ(UART_FR_REG) & UART_FR_RX_FIFO_EMPTY) == 0) {
337 c = REG_READ(UART_DR_REG) & 0xff;
338 if (tp->t_state & TS_ISOPEN)
339 l_r = (*tp->t_linesw->l_rint)(c, tp);
340 }
341 return 0;
342 }
343